3. LOL don't forget the Adams'es - John & John Quincy, and

And no/invisible dad = FDR ("James, 54 when Franklin was born, was considered by some as a remote father" ... overbearing mother, though)

& Abraham Lincoln ("Thomas enjoyed considerable status in Kentucky—where he sat on juries, appraised estates, served on country slave patrols, and guarded prisoners. By the time his son Abraham was born, Thomas owned two 600-acre (240 ha) farms, several town lots, livestock, and horses. He was among the richest men in the county")

5. Yes, and historians have also.

Too bad (???) for my brother and me, I guess; we'll never be president, as we had the kindest, most conciliatory (and Democratic) father ever, and he was with us for 98 years, that is, with the world, and with brother and me for 60+ years. He passed last year, and Tuesday was his 99th birth anniversary.